Smaller than the mountain gorilla, the lowland gorilla makes its home in dense rainforests in Western Africa. Countries in which the lowland gorilla can be found include Cameroon, Central African Republic, Congo, DR Congo, Equatorial Guinea and Gabon. Like the mountain gorilla, the lowland gorilla lives in groups called troops, with a dominant male (silverback) presiding over them. Unlike the mountain gorilla, the lowland gorilla is more likely to be found in trees, but is also found in dense ground foliage. The gestation period for females is 8.5 to 9 months, with females reaching sexual maturity at 10 years of age. Gorillas are omnivores with a lifespan of around 35 years. Although number vary from resource to resource, it is estimated that roughly 50,000-130,000 lowland gorillas (eastern and western) are left and this animal is on the endangered list.